Predicting Erasure of Test Patches in Printing Apparatus
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Solution Overview
Problem
In digital printing systems, the process of placing test patches on a rotatable imaging member often requires multiple cycles through a cleaning device to remove marking material, rendering the area around the patch unusable for image placement until complete removal, which inefficiencies the scheduling and utilization of printing resources.
Innovation Solution
A method is introduced to predict the number of rotations required for complete removal of a test patch based on real-time density measurements, allowing for reduced scheduled rotations and earlier re-imaging of the area, thereby optimizing the availability of the imaging member for new marking material and image placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test patches are placed on the imaging member and cleaned multiple times, then complete removal of marking material is achieved, but the area remains unusable for image placement during intermediate cycles
Solution Approach 1:
The system implements a feedback mechanism where the sensor measures the density of marking material on the test patch after each rotation. Based on this measured density, the scheduling system determines when the area is sufficiently cleaned and can be reused for new marking material, eliminating the need for fixed multiple rotation cycles
Solution Approach 2:
The cleaning schedule is made dynamic rather than static. Instead of predetermined fixed rotation cycles, the system continuously monitors marking material density and adjusts the timing of area reuse dynamically based on actual cleaning effectiveness, allowing optimal resource utilization
2Reliability
If a fixed number of rotations are scheduled for test patch removal, then complete cleaning is ensured, but opportunities for placing new test patches and images are reduced
Solution Approach 1:
The sensor provides real-time feedback on marking material density, enabling the scheduling system to determine the optimal moment to reuse the area. This feedback-driven approach replaces fixed rotation scheduling, minimizing unavailable time while ensuring adequate cleaning through continuous density monitoring
Solution Approach 2:
The system changes the parameter of cleaning verification from a fixed rotation count to a dynamic density threshold. By monitoring marking material density and comparing it against predefined thresholds, the system determines when cleaning is sufficient, allowing flexible area reuse timing that optimizes both cleaning effectiveness and resource utilization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the efficiency of printing systems by predicting when an area will be available for new marking material or images, increasing opportunities for placing test patches and images by reducing the number of rotations needed for test patch removal, thus improving overall system performance.
Implementation Method 1
a sensor for measuring a density of marking material on a test patch
Data Source
AI summary
In a printing apparatus having a rotatable imaging member, a test patch is created in a predetermined area of the imaging member. A density of the test patch is measured at least a first time, corresponding to a first rotation of the imaging member. Based at least partially on the measuring of the density of the test patch at least a first time, how many rotations in the future the predetermined area of the imaging member will be available for receiving new marking material is predicted.